To provide a method for driving a microspeaker for portable equipment which can reproduce superior low-frequency region and be made compact as well.

Load is applied to acoustic energy, and the acoustic energy is emitted from the front of the housing of the portable device without impairing the acoustic energy emitted from the rear of the microspeaker to increase low-frequency region sound pressure which is insufficient in the microspeaker. Low-frequency region sound pressure is enhanced by utilizing resonance of a small emission hole by emitting acoustic energy from the emission hole on the front, without impairing the acoustic energy emitted from the rear of the microspeaker.